Litto's questions

有 docker-compose.yml

services:
  web:
    build: ./php
    environment:
      - APACHE_RUN_USER=#1000
    volumes:
      - ${APP_PATH_HOST}:${APP_PATH_CONTAINER}
    ports:
      - 8080:80
    working_dir: ${APP_PATH_CONTAINER}
  db:
    image: mariadb
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: test
    volumes:
      - ./db:/var/lib/mysql
      - ./migr:/usr/data

  adminer:
    image: adminer
    restart: always
    ports:
      - 6080:8080

3个sql数据库转储存放在migr文件夹中，如何在构建项目时将它们导入到db容器中的数据库中？